I didn't answer and they didn't leave a message. I did try and call the number back and got a recording that the number is not in service.

"Hello, this is Derek with the Go Green Lawn Service---"  I cut in and warned him he had better take my name off any list he has because I would be reporting his unsolicited call.  I, of course, never have heard of them and would not do business with anyone who calls my house and disturbs me, particularly on a Saturday or Sunday.